A Datalog developer designs, develops, and maintains database systems using the Datalog language. They create logical and physical data models, optimize database performance, and ensure data integrity and security. They write complex Datalog queries to manipulate and retrieve data efficiently. They also solve database usage issues and malfunctions, collaborate with other developers to optimize system consistency, and work closely with data analysts and data scientists to ensure data solutions are robust and scalable. Furthermore, they may also be involved in developing user interfaces for database interaction and conducting data migration tasks.